Method _write_col_header

pandas/io/formats/html.py:277–398

(self, indent: int)

        self.write("</table>", indent)

    def _write_col_header(self, indent: int) -> None:
        row: list[Hashable]
        is_truncated_horizontally = self.fmt.is_truncated_horizontally
        if isinstance(self.columns, MultiIndex):
            template = 'colspan="{span:d}" halign="left"'

            sentinel: lib.NoDefault | bool
            if self.fmt.sparsify:
                # GH3547
                sentinel = lib.no_default
            else:
                sentinel = False
            levels = self.columns._format_multi(sparsify=sentinel, include_names=False)
            level_lengths = get_level_lengths(levels, sentinel)
            inner_lvl = len(level_lengths) - 1
            for lnum, (records, values) in enumerate(
                zip(level_lengths, levels, strict=True)
            ):
                if is_truncated_horizontally:
                    # modify the header lines
                    ins_col = self.fmt.tr_col_num
                    if self.fmt.sparsify:
                        recs_new = {}
                        # Increment tags after ... col.
                        for tag, span in list(records.items()):
                            if tag >= ins_col:
                                recs_new[tag + 1] = span
                            elif tag + span > ins_col:
                                recs_new[tag] = span + 1
                                if lnum == inner_lvl:
                                    values = (
                                        *values[:ins_col],
                                        "...",
                                        *values[ins_col:],
                                    )
                                else:
                                    # sparse col headers do not receive a ...
                                    values = (
                                        *values[:ins_col],
                                        values[ins_col - 1],
                                        *values[ins_col:],
                                    )
                            else:
                                recs_new[tag] = span
                            # if ins_col lies between tags, all col headers
                            # get ...
                            if tag + span == ins_col:
                                recs_new[ins_col] = 1
                                values = (*values[:ins_col], "...", *values[ins_col:])
                        records = recs_new
                        inner_lvl = len(level_lengths) - 1
                        if lnum == inner_lvl:
                            records[ins_col] = 1
                    else:
                        recs_new = {}
                        for tag, span in list(records.items()):
                            if tag >= ins_col:
                                recs_new[tag + 1] = span